Roofing Wind Uplift Ratings

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Roofing wind uplift ratings.

Damentals of wind uplift on low slope roofs. Mark gallant jun 22 2020. In the industry there is a need to sort out the confusion between building codes uplift rated assemblies and warranties by explaining what each offers and how they should be considered. These ratings actually apply to wind uplift pressure in pounds per square foot and are not directly related to wind speeds.

Roofs with field of roof uplift forces of 30 pounds per square foot are the maximum for 1 60 ratings and 37 5 pounds per square foot are the maximum for 1 75 ratings etc. Sometimes a roofing designer will assume that a design wind speed requirement of 90 mph then the roof system rating will be 1 90. Because fm approvals requires a 2 1 safety factor roofs with field of roof uplift forces of 30 pounds per square foot are the maximum for 1 60 ratings and 37 5 pounds per square foot are the maximum for 1 75 ratings etc. Asce 7 uplift ratings and warranties description.

With extreme wind events on the rise now is the time to. You only need to fill in either the city and state or the zip code. Duration series shingles are unrivaled by any other architectural shingles because they feature our patented surenail technology a technological breakthrough in shingle design. The use of wind pressure tables included in the monograph which allow the selection of wind pressure values without detailed calculations and converting them to fm global wind uplift ratings is explained.

How are wind uplift ratings determined. In this scenario our building. The paper examines the use of ultimate strength design safety provisions in wind uplift design. Wind speeds of 60 90 or 120 miles per hour.

Windspeedbyzip is a tool for architects engineers and builders to easily determine the 3 second gust basic windspeed figure 6 1 of asce 7 05 and now design wind speed per asce 7 10 maps for any location in the continental united states to determine the basic windspeed fill in the address below. The 2020 atlantic hurricane season is off to the fastest start in recorded history and warmer ocean temperatures are expected to generate hurricanes and tropical storms with much more frequency and intensity. The cost of a roof system is affected by the wind design but how are wind uplift ratings determined. The numeric designation 60 75 90 etc is the calculated wind uplift pressures with a 2 1 margin of safety applied.